Sublingual drug delivery allows systemic delivery of drug without difficulties connected with the gastrointestinal pathway. We developed a new simple protocol for easy-to-use processing and storage of porcine sublingual mucosal membrane for in vitro studies using "flash freezing" in liquid nitrogen. All the dextrans used as mucosal membrane integrity and permeability markers permeated only slowly through sublingual mucosa illustrating usability both the "fresh" and "flash frozen" sublingual membranes whereas conventional cold storage "frozen" membranes have shown significantly higher permeabilities for macromolecules due to the sustained damage. The permeability values were too low to expect dextrans to be potential carriers at this context. To test albumin as a drug carrier we compared FITC-albumin permeation from solutions vs. nanofiber mats donors. To increase the amounts and prolong the transport, we manufactured nanofiber mats loaded with fluorescently marked albumin using well-scalable electrospinning technology. Nanofiber mats have allowed albumin passage through the sublingual membrane in similar amounts as from the pure artificial saliva solution. Since salivary washout strictly limits the duration of liquid dosages, nanofiber mats may thus permit prolonged sublingual administration.
- MeSH
- albuminy aplikace a dávkování MeSH
- aplikace sublinguální MeSH
- dextrany aplikace a dávkování MeSH
- fluorescein-5-isothiokyanát aplikace a dávkování analogy a deriváty MeSH
- kofein aplikace a dávkování MeSH
- lékové transportní systémy * MeSH
- nanovlákna aplikace a dávkování MeSH
- permeabilita MeSH
- prasata MeSH
- roztoky MeSH
- sliznice anatomie a histologie metabolismus MeSH
- zmrazování MeSH
- zvířata MeSH
- Check Tag
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
A considerable obstacle of the real nanofiber use in drug dosage forms consists in the low weight of the doses and in the content non-uniformity of medicated nanofiber products, especially of those manufactured on a large scale. The electrospinning nanofiber technology is the most promising in this context; however, no results obtained by validated production have been published so far. Here we present the results of the validation study of electrospun medicated strips intended for administration of rizatriptan as a drug medicated in milligrams per dose. The results obtained demonstrate a compliance with the good manufacturing practice and pharmacopoeial requirements on weight and content uniformity. We have concluded that the tested Nanospider™ electrospinning technology is validable and thus suitable for a wide number of drugs intended for single-dose administration of small drug quantities.
Je uveden přehled vývojových anomálií na krku u dětí a mladistvých. Jedná se především o laterální krční píštěl a cystu, mediální krční cystu, dermoid, cévní malformace a anomálie velkých krčních cév. Cílem je přiblížení problematiky klinickému logopedovi a upozornění na možnost poruchy polykání u některých chorob, které jsou demonstrovány na kazuistikách.
An outline of developmental anomalies in the neck of children and adolescents is provided. These include, in particular, lateral cervical fistulas and cysts, medial cervical cysts, and anomalies of large cervical vessels. The aim is to give speech and language pathologists an insight into the issue and to highlight the possibility of swallowing disorders in some diseases demonstrated in case reports.
- MeSH
- arteria subclavia diagnostické zobrazování patologie MeSH
- cévní malformace diagnostické zobrazování terapie MeSH
- cysty chirurgie diagnostické zobrazování klasifikace patologie MeSH
- dermoidní cysta chirurgie diagnostické zobrazování MeSH
- diferenciální diagnóza MeSH
- dítě MeSH
- hemangiom diagnostické zobrazování farmakoterapie MeSH
- kojenec MeSH
- lidé MeSH
- mladiství MeSH
- nemoci cév chirurgie klasifikace terapie vrozené MeSH
- nemoci příušní žlázy diagnostické zobrazování farmakoterapie MeSH
- otorinolaryngologické nemoci * chirurgie diagnostické zobrazování klasifikace patologie terapie vrozené MeSH
- píštěle chirurgie diagnostické zobrazování klasifikace patologie MeSH
- poruchy polykání diagnostické zobrazování patologie MeSH
- předškolní dítě MeSH
- tonzilektomie MeSH
- Check Tag
- dítě MeSH
- kojenec MeSH
- lidé MeSH
- mladiství MeSH
- mužské pohlaví MeSH
- předškolní dítě MeSH
- ženské pohlaví MeSH
- Publikační typ
- kazuistiky MeSH
- přehledy MeSH
Protein-coated resorbable synthetic polymeric nanofibrous membranes are promising for the fabrication of advanced skin substitutes. We fabricated electrospun polylactic acid and poly(lactide-co-glycolic acid) nanofibrous membranes and coated them with fibrin or collagen I. Fibronectin was attached to a fibrin or collagen nanocoating, in order further to enhance the cell adhesion and spreading. Fibrin regularly formed a coating around individual nanofibers in the membranes, and also formed a thin noncontinuous nanofibrous mesh on top of the membranes. Collagen also coated most of the fibers of the membrane and randomly created a soft gel on the membrane surface. Fibronectin predominantly adsorbed onto a thin fibrin mesh or a collagen gel, and formed a thin nanofibrous structure. Fibrin nanocoating greatly improved the attachment, spreading, and proliferation of human dermal fibroblasts, whereas collagen nanocoating had a positive influence on the behavior of human HaCaT keratinocytes. In addition, fibrin stimulated the fibroblasts to synthesize fibronectin and to deposit it as an extracellular matrix. Fibrin coating also showed a tendency to improve the ultimate tensile strength of the nanofibrous membranes. Fibronectin attached to fibrin or to a collagen coating further enhanced the adhesion, spreading, and proliferation of both cell types.
- MeSH
- buněčná adheze MeSH
- extracelulární matrix metabolismus MeSH
- fibrin metabolismus MeSH
- fibroblasty cytologie metabolismus MeSH
- fibronektiny metabolismus MeSH
- keratinocyty cytologie metabolismus MeSH
- kolagen metabolismus MeSH
- kultivované buňky MeSH
- lidé MeSH
- nanovlákna chemie MeSH
- pevnost v tahu MeSH
- polymery chemie MeSH
- proliferace buněk MeSH
- tkáňové inženýrství MeSH
- tkáňové podpůrné struktury chemie MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
Závěrečná zpráva o řešení grantu Interní grantové agentury MZ ČR
1 svazek : ilustrace ; 30 cm
Cílem projektu je rozvoj citlivých screeningových metod pro záchyt dysfagie prováděných sestrou, definice multioborového týmu pro poruchy polykání, definice diagnosticko-terapeutických postupů/standardů v rámci každé odbornosti a průchodu pacienta tímto systémem. Ve studii bude prostřednictvím dotazníku SWAL-QOL na počátku a po diagnostice a léčbě dle definovaného standardu hodnocena kvalita života pacienta s dysfagií. Výsledkem projektu bude doporučený standardní postup pro diagnostiku a terapii dysfagie aplikovatelný v podmínkách České republiky včetně zapojení nových diagnosticko-terapeutických metod (screeningová metoda, FEES, videofluoroskopie). Výstupem projektu bude dále zatím v České republice neprováděné statistické vyhodnocení kvality života pacientů s dysfagií prostřednictvím standardizovaných nástrojů SWAL-QOL a SWAL-CARE. Očekávaným benefitem projektu je časnější záchyt a terapie dysfagie a jejích komplikací, racionalizace a ekonomizace použitých postupů, zvýšení kvality života pacientů.; The aim is to develop sensitive screening methods for dysphagia interception, define multidisciplinary team for dysphagia, to define diagnostic and therapeutic procedures/standards within single specialty and to describe algorithm of patient passing through this system. In the study the quality of life will be judged at the beginning and after the diagnostic and treatment by the mean of SWAL-QOL questionnaire. The result of the project will be the guideline applicable in Czech Republic health system conditions including introduction of new screening and diagnostic and therapeutic methods. The outcome of the project also will be (so far in the Czech Republic not realized) statistical evaluation of quality of life of patients with dysphagia by the means of standardized instruments SWAL-QOL and SWAL-CARE. The earlier interception and therapy of dysphagia and its complications, rationalization and economization of applied procedures and quality of life improvement are the expected benefits of the project.
- MeSH
- diagnostické techniky a postupy MeSH
- elektromyografie MeSH
- endoskopie MeSH
- fluoroskopie MeSH
- gastrointestinální endoskopie MeSH
- kvalita života MeSH
- plošný screening MeSH
- poruchy polykání diagnóza terapie MeSH
- průzkumy a dotazníky MeSH
- Konspekt
- Patologie. Klinická medicína
- NLK Obory
- otorinolaryngologie
- NLK Publikační typ
- závěrečné zprávy o řešení grantu IGA MZ ČR
Fibrin plays an important role during wound healing and skin regeneration. It is often applied in clinical practice for treatment of skin injuries or as a component of skin substitutes. We prepared electrospun nanofibrous membranes made from poly(l-lactide) modified with a thin fibrin nanocoating. Fibrin surrounded the individual fibers in the membrane and also formed a thin fibrous mesh on several places on the membrane surface. The cell-free fibrin nanocoating remained stable in the cell culture medium for 14 days and did not change its morphology. On membranes populated with human dermal fibroblasts, the rate of fibrin degradation correlated with the degree of cell proliferation. The cell spreading, mitochondrial activity, and cell population density were significantly higher on membranes coated with fibrin than on nonmodified membranes, and this cell performance was further improved by the addition of ascorbic acid in the cell culture medium. Similarly, fibrin stimulated the expression and synthesis of collagen I in human dermal fibroblasts, and this effect was further enhanced by ascorbic acid. The expression of beta1-integrins was also improved by fibrin, and on pure polylactide membranes, it was slightly enhanced by ascorbic acid. In addition, ascorbic acid promoted deposition of collagen I in the form of a fibrous extracellular matrix. Thus, the combination of nanofibrous membranes with a fibrin nanocoating and ascorbic acid seems to be particularly advantageous for skin tissue engineering.
- MeSH
- buněčná diferenciace MeSH
- elektrochemie metody MeSH
- extracelulární matrix metabolismus MeSH
- fibrin chemie metabolismus MeSH
- fibroblasty cytologie metabolismus MeSH
- fluorescenční protilátková technika MeSH
- imunoenzymatické techniky MeSH
- kolagen genetika metabolismus MeSH
- kultivované buňky MeSH
- kůže cytologie metabolismus MeSH
- kvantitativní polymerázová řetězová reakce MeSH
- lidé MeSH
- messenger RNA genetika MeSH
- nanovlákna chemie MeSH
- polyestery chemie MeSH
- polymerázová řetězová reakce s reverzní transkripcí MeSH
- proliferace buněk MeSH
- regenerace fyziologie MeSH
- tkáňové inženýrství metody MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
It may be possible to regulate the cell colonization of biodegradable polymer nanofibrous membranes by plasma treatment and by the density of the fibers. To test this hypothesis, nanofibrous membranes of different fiber densities were treated by oxygen plasma with a range of plasma power and exposure times. Scanning electron microscopy and mechanical tests showed significant modification of nanofibers after plasma treatment. The intensity of the fiber modification increased with plasma power and exposure time. The exposure time seemed to have a stronger effect on modifying the fiber. The mechanical behavior of the membranes was influenced by the plasma treatment, the fiber density, and their dry or wet state. Plasma treatment increased the membrane stiffness; however, the membranes became more brittle. Wet membranes displayed significantly lower stiffness than dry membranes. X-ray photoelectron spectroscopy (XPS) analysis showed a slight increase in oxygen-containing groups on the membrane surface after plasma treatment. Plasma treatment enhanced the adhesion and growth of HaCaT keratinocytes on nanofibrous membranes. The cells adhered and grew preferentially on membranes of lower fiber densities, probably due to the larger area of void spaces between the fibers.
- MeSH
- buněčná adheze fyziologie MeSH
- buněčné linie MeSH
- keratinocyty cytologie fyziologie MeSH
- lidé MeSH
- membrány umělé * MeSH
- nanovlákna chemie ultrastruktura MeSH
- obvazy MeSH
- pevnost v tahu MeSH
- pevnost v tlaku MeSH
- plazmové plyny chemie MeSH
- pokovování galvanické MeSH
- povrchové vlastnosti MeSH
- proliferace buněk fyziologie MeSH
- testování materiálů MeSH
- tvrdost MeSH
- umělá kůže * MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH